3.
已知椭圆\(C: \dfrac {x^{2}}{a^{2}}+ \dfrac {y^{2}}{b^{2}}=1(a > b > 0)\),\(F_{1}(-1,0)\),\(F_{2}(1,0)\)分别是椭圆的左、右焦点,过点\(F_{2}(1,0)\)作直线\(l\)于椭圆\(C\)交于\(A\),\(B\)两点,\(\triangle ABF_{1}\)的周长为\(4 \sqrt {3}\).
\((I)\)求椭圆\(C\)的方程;
\((\)Ⅱ\()\)若\(OA⊥OB.\)求直线\(l\)的方程.